vp9-svc: Set downsampling filter for VGA layer.
Downsampling filter for SVC was set to subsample (phase 0) for HD -> VGA, and bilinear averaging (phase 8) for VGA -> QVGA. This change makes it bilinear averaging for HD -> VGA. Given the recent commit 9f9d4f8d, quality is improved with this change: avgPSNR/SSIM up ~1-3% on HD clips in RTC set. Speed decrease of ~1% for 3 layer SVC. Change-Id: If834a320e372b8b922a6bf7cab4227703b1beae6
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